Type-writer.



J. McRAVEN.

TYPE WRITER. APPLICATION FILED MAR. 17. 1914.

1,139,880. Patented May 18,1915.

3 SHEETSSHEET I.

J. IVIcRAVEN.

TYPE WRITER.

APPLICATION FILED MAR. 17. 1914.

1,139,880. Patented May 18, 1915.

3 SHEETSSHEET 2.

(/ajw/ g i 7afir/J JOHN McRAVEN, or LITTLE ROCK, Anmfisas.

' TYPE-WRITER.

Specification of Letters Patent.

Patented. May 18, 1915.

Application filed march 17, 1914. Serial No. 825,891..

To all whom it may concern:

Be it known that I, JOHN MoRAvEN, acitizen of the .UnitedStates, and resident of Little Rock, Pulaski county, Arkansas, have invented certain new and useful Improvements in Type-Writers, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

'My invention relates to improvements in typewriters, and the principal object of my invention is to construct a machine having a platen arranged on a vertical axis and provided with means for simultaneously rotating and axially moving the platen in .order to minimize the platen movement between the terminal end of one printing line and the initial end of the succeeding printing line. a

A further object of my invention is to construct a machine having a platen which-is movable for line spaces against gravity so that the platen may be returned by gravity without the intervention of springs or other extraneous source of power, as is common.

I These and other objects will be made more clear in the following specification and illustrated in detail in theaccompanying drawings, in which- Figure 1 is a transverse sectional elevation of the machine showing a portion of the platen and its rotatable support in section; Fig. 2 is a sectional plan of the frame taken on a line beneath the type bars; Fig. 3 shows in detail the means for rotating the platenforletter spacing; Fig.4 shows in detail the line spacing mechanism; Fig. 5 is a fragmental elevation of the platen partly broken away illustr'atin in detail the. releasable dog associated with the platen lifting mechanism; Fig. 6 illustrates in detail the connection between the key and a rotatable tilt-' ing rod-associated with the platen lifting mechanism; and Fig. 7 is a sectional plan illustrating the mounting of the tilting rod and the yielding gear wheelthereon.

Referring by numerals to the accompanying drawings: 10 designatesthe base of the machine frame. Supported by the base '10-is a 'number of uprights 11 arranged for the support of the upper frame member 12 which carries the basket 13.

14 designates a ring supported on radial arms 15 extending from theuprights 11.

16 designates a barrel rigidly secured to.

the ring 14, which barrel has at its upper I end an annulment-standing flange 17 having in its upper and -.lower faces ball races 18.

19 designates a rotating carriage which-issupported for rotation upon balls 20 carried by said ball races, and-supported upon said carriage so that they will rotate with said carriage are the guides 21. The exterior faces of said guides are preferably segmental shape and arranged to form surfaces upon which the platen 22 may freely move axially.

On the inside face of the platen there are the spaced apart ribs 23 which form channels co-acting with the guides 21 to hold the platen in true vertical position. I

Arranged lengthwise of one rib of each pair is a rack-bar 24 and aranged within the platen is a spider 25 having at the free. end of each of its arms a pawl 26, which pawls.

are arranged to engage the teeth of the rackbars so that when the spider is elevated the pawls will lift the platen a distance at least equalto the tooth lengths of the rack-bars.

27 designates arod'eonnectedat its one end to the spider 25 and which is held in a bear ng 28 secured to the base 10, the rod being free to move axially through said bearing.

29 designates'a bevel gear wheel secured to. rotate with the rod 27.

30 designates a shaft which is mounted for rotation in'a sleeve 31 and which. sleeve is provided with'trunnions 32 mounted -so 35 designates abevel gear wheel which-is secured to the shaft 30 by a feather36," that the wheel may have axial movement relative to the shaft.

37 designates an 'extensile coil spring arranged to hold the gear wheel 35 normally to its forward limit-of movement in mesh with the gear wheel 29 on the rod 27;

'40 designates a star wheel secured-to r0 tate with the shaft 30, the function of which is made clear hereinafter.

Extending upwardly from wardthe rear of the machine there is a bearing 41 in which there is secured a rod 42 on which a series of levers 43 is carried.

Each of these levers has at its forward end lea the base to;

a key 44 and one of said levers carries a foot 45 arranged to engage one of the teeth of said star wheel 40, while another of said levers carries a foot 46 arranged to engage the shaft 30 to tilt it at times. Certain other of the levers 43 carry keys 47 bearin thereon the characters to be written. Eac

of these last mentioned levers has secured thereto a vertically arranged rod 48 extending to hell crank levers 49 connected with links 50 which are pivotally secured to ears 51 secured to the type bars 52, said type barsbeing mounted on shafts 53 toward the front and top. of the machine.

In the free terminal endof each of these type bars there is a type 54, the normal position of said type bars being at rest against the basket 13. I

Secured to a air of the levers 43 is a space bar 55. ecured to the base 10 is a pair of bearings 56 arranged for .the support 'of' a rock shaft 57, at each end of which there are the levers 58 connected with a universal rod 59 extending beneath .the le- 63 designates a post which is secured to the rotating carriage and arranged to project upwardly through the platen to terminate in the proximity of the spider and is arranged for the support of a spring actuated dog 64 coacting with a rack bar 65 secured to the platen, for the support of the platen, after it has-been lifted by the dogs 26 so that the dogs will fall to a new tooth without lowering the platen.

Extending over the front of,the platen near its top is a ribbon 66 in a position to be engaged by the type.

Carried by the platen are paper holding strips 67 and 68, each of which is supported on studs 69 carried by the platen and spring held against the platen, so that they may be released from the platen for the insertion of a sheet of paper, which sheet is arranged to completely embrace the platen and have its side margins held inplace by said strips. It is to be observed that, by reason of the universal rods 59, a letter space will be made each time any oneof the keys is deline, the key 44 associated with bearing levers,

' pressed and that, when one of the keys 44 is depressed, the foot 46 will engage the shaft 30 and tilt said shaft, which tilting by reason of the interengagement of the bevel gear wheels will lift the platen for line spacing, and that when it is desired to lift and turn the platen so as to bring the printing point from the terminal end of one line to a printing point at the initial end of the succeeding the foot 45 is depressed, bringing the foot into engagement with the star wheel 40, which simultaneously tilts and turns the shaft 30, the tilting causing the lifting of the platen and the turning a rotation of the platen.

I claim:

1. In a typewriter, a vertically disposed and rotatable platen, a plurality of key type bearing elements connected for operation with certain. ofsaid key bearing levers, a vertically disposed rack connected for vertical movement with said platen, a pawl arranged for coaction with said rack, a rod connected with said pawl, said rod being arranged to be freely movable axially relative to the platen, but

fixed to rotate therewith, a shaft, a support for said shaft permitting of rotation and a bodily tilting of the shaft, a gear connection between said shaft and rod, and independent devices associated with certain of said key bearing levers for engagement With said shaft, one of said devices arranged to simply tilt the shaft for an elevation of the platen and the other device arranged to tilt and rotate said shaft for the and rotating of the platen.

7 2.- In a type writer, a revoluble base, vertical guides revoluble with the base, a tubular platen surrounding and movable with respectto the of racks secure within the platen, a dog for eachrack, means for collectively elevating and rotating said dogs, for the eleva tion of the platen one line space and the rotation of the platen from the terminal end of one printing line to the initial end of the next succeeding printing line, and means for rotating the platen for letter spacing independently of the rotating means, including the dogs and racks.

In testimony whereof, I have signed my name to this specification, in presence of two subcribingwitnesses.

I JOHN, MGRAVEN. Witnesses W. J. Rcrnmiv, Jr., J. B. Wnnsrrm.

elevating ides and base, a number 

